package com.study.d3_session;

import javax.servlet.ServletException;
import javax.servlet.annotation.WebServlet;
import javax.servlet.http.HttpServlet;
import javax.servlet.http.HttpServletRequest;
import javax.servlet.http.HttpServletResponse;
import javax.servlet.http.HttpSession;
import java.io.IOException;

/**
 * Session会话跟踪方案的原理：Session的底层是基于Cookie的（Set-Cookie，Cookie）
 * 优点：存储在服务端，安全
 * 缺点：服务器集群环境下无法直接使用Session以及Cookie的缺点
 */
@WebServlet("/s")
public class SessionReq extends HttpServlet {
    @Override
    protected void doGet(HttpServletRequest req, HttpServletResponse resp) throws ServletException, IOException {
        HttpSession session = req.getSession();
        session.setAttribute("age","20");
    }
}
